I came across this story and thought it was an interesting one.
A person makes a vulgar post, (not all that terribly vulgar by normal human standards, but incautious and in poor judgement in the context of the written word) apparently in the comments section of someones blog, and when the comment is quickly deleted, the person repeats the post.
The blogger somehow determines that the poster is posting from a school computer, makes a phone call, leading to the quick resignation of the poster when the school identifies him.
Then the blogger reports on this series of events.
The comments to this final report are what is interesting. Most commenters take the position that this is an intolerable act on the bloggers part, that he should not have done anything more than ban the poster.
This is pretty much my position as well - I think the blogger who called the school was wrong.
But it's a curious question. If you are interested in this kind of issue, you might enjoy reading this webpage, especially the long long string of comments that follow. Some of it gets partisan, but that reflects the country we live in.